Communicating with a Tree Control
You use different methods for calling member functions in a CTreeCtrl object depending on how the object was created:
If the tree control is in a dialog box, use a member variable of type CTreeCtrl that you create in the dialog box class.
If the tree control is a child window, use the CTreeCtrl object (or pointer) you used to construct the object.
If you're using a CTreeView object, use the function CTreeView::GetTreeCtrl to get a reference to the tree control. You can initialize another reference with this value or assign the address of the reference to a CTreeCtrl pointer.